Prince George's County corrections officials said yesterday that officers mistakenly released two inmates in the last three weeks, bringing to 13 the number of prisoners released because of human or computer error in the 12 months since the first inmates were housed in the county's correctional center.

Christy Merenda, a spokeswoman for the Corrections Department, said that officials discovered Friday that the two inmates had been erroneously released.

Officials said Rhonda Juanita Martin, 25, a county resident who was being held on 11 counts of writing bad checks, was released about 1:30 a.m. Friday. Sheriff's deputies found Martin at her home, and she was back in the jail by 5 a.m., Merenda said.

Later that day, Merenda said, officials discovered that Alton Miller, 33, of Chillicothe, Ohio, had been released by mistake on Feb. 10. Miller had been given a suspended sentence on a drug charge in the county, Merenda said, and he should have been returned to Ohio to complete a sentence on drug and weapons charges. Miller was still at large yesterday evening.

Merenda said the shift commander on duty at the times when the inmates were released has been placed on administrative leave with pay pending the results of an internal investigation.